class ball  

{

public:

	int y;

	int x;

	ball();

	virtual ~ball();



};

class CAboutDlg : public CDialog

{

public:

	CAboutDlg();



// Dialog Data

	//{{AFX_DATA(CAboutDlg)

	enum { IDD = IDD_ABOUTBOX };

	//}}AFX_DATA



	// ClassWizard generated virtual function overrides

	//{{AFX_VIRTUAL(CAboutDlg)

	protected:

	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support

	//}}AFX_VIRTUAL



// Implementation

protected:

	//{{AFX_MSG(CAboutDlg)

	//}}AFX_MSG

	DECLARE_MESSAGE_MAP()

};



CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)

{

	//{{AFX_DATA_INIT(CAboutDlg)

	//}}AFX_DATA_INIT

}



void CAboutDlg::DoDataExchange(CDataExchange* pDX)

{

	CDialog::DoDataExchange(pDX);

	//{{AFX_DATA_MAP(CAboutDlg)

	//}}AFX_DATA_MAP

}



BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)

	//{{AFX_MSG_MAP(CAboutDlg)

		// No message handlers

	//}}AFX_MSG_MAP

END_MESSAGE_MAP()



/////////////////////////////////////////////////////////////////////////////

// CDRAWDlg dialog



CDRAWDlg::CDRAWDlg(CWnd* pParent /*=NULL*/)

	: CDialog(CDRAWDlg::IDD, pParent)

{

	//{{AFX_DATA_INIT(CDRAWDlg)

		// NOTE: the ClassWizard will add member initialization here

	//}}AFX_DATA_INIT

	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32

	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);

}



void CDRAWDlg::DoDataExchange(CDataExchange* pDX)

{

	CDialog::DoDataExchange(pDX);

	//{{AFX_DATA_MAP(CDRAWDlg)

		// NOTE: the ClassWizard will add DDX and DDV calls here

	//}}AFX_DATA_MAP

}



BEGIN_MESSAGE_MAP(CDRAWDlg, CDialog)

	//{{AFX_MSG_MAP(CDRAWDlg)

	ON_WM_SYSCOMMAND()

	ON_WM_PAINT()

	ON_WM_QUERYDRAGICON()

	ON_WM_KEYDOWN()

	//}}AFX_MSG_MAP

END_MESSAGE_MAP()



/////////////////////////////////////////////////////////////////////////////

// CDRAWDlg message handlers



BOOL CDRAWDlg::OnInitDialog()

{

	CDialog::OnInitDialog();



	// Add "About..." menu item to system menu.



	// IDM_ABOUTBOX must be in the system command range.

	ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);

	ASSERT(IDM_ABOUTBOX < 0xF000);



	CMenu* pSysMenu = GetSystemMenu(FALSE);

	if (pSysMenu != NULL)

	{

		CString strAboutMenu;

		strAboutMenu.LoadString(IDS_ABOUTBOX);

		if (!strAboutMenu.IsEmpty())

		{

			pSysMenu->AppendMenu(MF_SEPARATOR);

			pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);

		}

	}



	// Set the icon for this dialog.  The framework does this automatically

	//  when the application's main window is not a dialog

	SetIcon(m_hIcon, TRUE);			// Set big icon

	SetIcon(m_hIcon, FALSE);		// Set small icon

	

	// TODO: Add extra initialization here

	

	return TRUE;  // return TRUE  unless you set the focus to a control

}



void CDRAWDlg::OnSysCommand(UINT nID, LPARAM lParam)

{

	if ((nID & 0xFFF0) == IDM_ABOUTBOX)

	{

		CAboutDlg dlgAbout;

		dlgAbout.DoModal();

	}

	else

	{

		CDialog::OnSysCommand(nID, lParam);

	}

}



// If you add a minimize button to your dialog, you will need the code below

//  to draw the icon.  For MFC applications using the document/view model,

//  this is automatically done for you by the framework.









void myEllipse(CDC *dc, POINT ptCenter, UINT uRadius)

{

POINT ptLeftTop, ptRightBottom;



ptLeftTop.x = ptCenter.x - uRadius;

ptLeftTop.y = ptCenter.y - uRadius;

ptRightBottom.x = ptCenter.x + uRadius;

ptRightBottom.y = ptCenter.y + uRadius;



Ellipse(*dc, ptLeftTop.x, ptLeftTop.y,

ptRightBottom.x, ptRightBottom.y);

} 画圆函数。转换为半径，圆心。



int r=20; 

void CDRAWDlg::OnPaint() 

{

	if (IsIconic())

	{

		CPaintDC dc(this); // device context for painting



		SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);



		// Center icon in client rectangle

		int cxIcon = GetSystemMetrics(SM_CXICON);

		int cyIcon = GetSystemMetrics(SM_CYICON);

		CRect rect;

		GetClientRect(&rect);

		int x = (rect.Width() - cxIcon + 1) / 2;

		int y = (rect.Height() - cyIcon + 1) / 2;



		// Draw the icon

		dc.DrawIcon(x, y, m_hIcon);

	}

	else

	{

		int x=0;

		CDialog::OnPaint();

	 CDC *pDC =GetDC();

    CBrush brushColor(RGB(255,255,0));//填充的颜色

    CPen penColor;

    penColor.CreatePen(PS_SOLID,1,RGB(0,64,128));//边框颜色

    pDC->SelectObject(penColor);

    pDC->SelectObject(brushColor);



   

CPoint p(b.x,b.y);

myEllipse(pDC,p,r);

    brushColor.DeleteObject();

   penColor.DeleteObject();

  ReleaseDC(pDC);



	}

}



// The system calls this to obtain the cursor to display while the user drags

//  the minimized window.

HCURSOR CDRAWDlg::OnQueryDragIcon()

{

	return (HCURSOR) m_hIcon;

}







void CDRAWDlg::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags) 

{

	// TODO: Add your message handler code here and/or call default

	

	CDialog::OnKeyDown(nChar, nRepCnt, nFlags);



  switch(nChar)



       {



       case VK_LEFT://按下左键



              b.x=b.x-10;

			 

UpdateWindow();



              break;    



       case VK_RIGHT://按下右键

               b.x=b.x+10;

            UpdateWindow();



              break;



       case VK_UP://按下上键



               b.y=b.y+10;

UpdateWindow();



              break;



       case VK_DOWN:// 按下下键



              b.y=b.y-10;

UpdateWindow();



              break;



       default:



              break;



       }



}